Dust Sources

Dust Control

There are three types of sites or activities governed by Maricopa County dust control regulations. If you have any questions about whether your site or activities are covered by these regulations, please call 602-506-6010.

Dust control certifications are required in order to engage in many dust-generating activities. Visit our Dust Control Training page to learn more, or to find out if you need dust control certification.

Traditional Dust-Generating Activities (Rule 310)

Any activity capable of generating fugitive dust (such as construction, earthmoving, demolition, or weed abatement), regardless of the size of the site, must comply with Rule 310 and control potential dust.

Gravel, Concrete, Asphalt & Related Activities (Rule 316)

Processing plants that mine, excavate, separate, combine, crush or grind any nonmetallic mineral are governed by Rule 316. ‘Nonmetallic minerals’ includes (but is not limited to) crushed and broken stone, sand and gravel, clay, rock salt, gypsum, sodium compounds, and mixtures of these minerals such as concrete and asphalt.

Some types of facilities or activities governed by Rule 316 are:

Crushing and screening of nonmetallic minerals

Sand and gravel operations

Asphalt plants

Concrete batch plants

A permit is required for all types of facilities and activities governed by Rule 316. Stationary sources within Maricopa County and portable sources that operate exclusively within Maricopa County must obtain permits from the Maricopa County Air Quality Department. Portable sources that operate in both Maricopa County and other counties must obtain a permit from the Arizona Department of Environmental Quality.